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I have an older motor, appears to date pre 1960. It is compact and power dense, producing 100 hp up to 7000 rpm. It has two sets of thermocouple wires. I believe that the motor will over heat quickly if the temperature is too high. But how do I connect the old thermocouple wires, and how to determine the type of thermocouple. Each thermocouple has three wires.
And got the following answer:
Are you sure they are both thermocouples? it could be that one/both is a centrifugal switch that opens(or shuts) when the motor is turning at faster than certain speed. That's a very big motor, so connecting it straight up to a supply *would* cause a lot of problems- I'd expect some kind of signals to control a starter so the motor didn't break the electrical supply on start up. I'd guess a thermocouple could be used to *signal* that the motor was getting too hot. thermocouples are like tiny batteries driven by heat, and their signals need amplification before being useful.Often something called an instrumentation amp is used, to get the signal up to useful levels, but if it's a simple over temp sensor, a voltage comparator can be used to produce a signal when the temperature is high (or low).http://en.wikipedia.org/wiki/Comparator the output from the voltage comparator probably need some amplification, but that would interface with a motor controller. The voltage between thermocouple output leads will depend on their material (and the temperature of the joint that the voltmeter makes with the leads). If you can fish the thermocouple out it would likely be easier, but understand it might be built into the motor. if you place the motor/thermocouple into some kind of thermostatically controlled oven, and give it enough time for the heat to permeate through the motor (heat soak), you can be fairly certain that the thermocouple has reached the temperature of the oven say 120 deg C. find the room temperature, and subtract that from the motor temperature (which should be 120), to find the temperature difference the thermocouple is measuring. If the motor had been left outside the oven overnight it would be at room temperature, and so there would be no temperature difference, and the voltage output from the thermocouple would be 0. So you've now got two data points, and can calibrate the thermocouple to figure out (approximately) what it's uV/deg C is. If you need to find out what kind of thermocouple it actually is look up the uV/deg C data from something like http://en.wikipedia.org/wiki/Thermocouple#Types to see if any of the standard types would produce similar voltages for the same temperature differences. That should reduce the possibilities somewhat.